Camping site near Sacramento, perferably a beach camp site?

Hi, I'm thinking of going camping soon, but am not sure where to go. I live in Sacramento, CA, so some place not too far would be great. Any suggestions? Also, I'd prefer to go camping near the beach, if anyone has any suggestions for that? Or maybe refer me to some sites I can look at for more info? Thanks! Sorry, by beach, I meant I'd rather go to a beach somewhere in Northern Cali; not like a beach camp site in San Diego or something. It doesn't necessarily have to be near Sacramento, because I know there isn't much in the way of oceans around here. Thanks!
Sacramento is at least a hundred miles from the ocean, so by beach, I'm assuming you mean some sort of river beach or lake beach? There are several camp sites along the Sacramento River, American River (maybe?), and at Folsom Lake. If you really mean the ocean, then you could drive to the Santa Cruz area, or over to the Point Reyes area?